Scores from shot centre half has left, mistakenly (7)
I believe the answer is:
notches
'scores' is the definition.
The definition and answer can be both acts as well as being plural nouns.
Maybe there's a link between them I don't understand?
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for notches that I've seen before include "Nicks" , "Makes small indentation in" , "Small v-shaped cuts" , "Small indentations found on chest" , "V-Shaped cuts or indentations" .)